US20150135670A1 - Variable speed control systems and methods for walk behind working machine - Google Patents
Variable speed control systems and methods for walk behind working machine Download PDFInfo
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- US20150135670A1 US20150135670A1 US14/081,875 US201314081875A US2015135670A1 US 20150135670 A1 US20150135670 A1 US 20150135670A1 US 201314081875 A US201314081875 A US 201314081875A US 2015135670 A1 US2015135670 A1 US 2015135670A1
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- control
- control lever
- angular position
- machine component
- handle
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000000994 depressogenic effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 210000003813 thumb Anatomy 0.000 description 2
- 210000003811 finger Anatomy 0.000 description 1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/006—Control or measuring arrangements
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/67—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator
- A01D34/68—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator with motor driven cutters or wheels
- A01D34/6806—Driving mechanisms
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/67—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator
- A01D34/68—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator with motor driven cutters or wheels
- A01D2034/6843—Control levers on the handle of the mower
Definitions
- the subject matter disclosed herein relates generally to variable control systems for powered equipment. More particularly, the subject matter disclosed herein relates to variable speed controls and methods for walk-behind working machines, such as lawnmowers.
- a control system is typically carried on the handle to allow the operator to engage and disengage the self-propel system and to select a desired ground speed.
- many such control systems use a pivotable ground speed control bail on the handle of the working machine. In such systems, the bail can be pivoted to engage the self-propel system, with the degree of movement of the ground speed control bail dictating the ground speed of the working machine.
- variable speed control systems and methods for walk-behind working machines are provided.
- a variable speed control system for a walk-behind working machine is provided.
- the system can comprise a control system base, a handle having a recess being formed in an edge of the handle, a control lever comprising a lever arm having a first end that is pivotably attached to the control system base and a second end substantially opposing the first end that comprises a grip portion, and a control connector connected between the control lever and a machine component.
- the control lever can be selectively pivotable with respect to the control system base between a first angular position at which the grip portion of the control lever is spaced apart from the handle and a second angular position at which at least a portion of the grip portion is positioned within the recess of the handle.
- the control connector can be configured to control the machine component to be in a first operating state when the control lever is in the first angular position and to be in a second operating state when the control lever is in the second angular position.
- a variable speed control system for a walk-behind working machine can comprise a control system base, a handle having a recess disposed or formed in an edge of the handle, a control lever comprising a lever arm having a first end that is pivotably attached to the control system base and a second end substantially opposing the first end that comprises a grip portion, and a control connector connected between the control lever and a machine component.
- the control lever can be selectively pivotable with respect to the control system base among a first angular position at which the grip portion of the control lever is spaced apart from the handle and a second angular position at which an outer surface of the grip portion of the control lever is substantially flush with an outer surface of the handle, and the control connector can be configured to control the machine component to be in a relatively low-speed operating state when the control lever is in the first angular position and to be in a relatively high-speed operating state when the control lever is in the second angular position.
- a method for varying a speed of a walk-behind working machine can comprise pivoting a control lever with respect to a control system base between a first angular position at which a grip portion of the control lever is spaced apart from a handle and a second angular position at which at least a portion of the grip portion is positioned within a recess formed in an edge of the handle.
- pivoting the control lever to the first angular position controls a machine component to be in a first operating state
- pivoting the control lever to the second angular position controls a machine component to be in a second operating state.
- FIG. 1 a is a perspective view of a variable speed control system in a first operating position according to an embodiment of the presently disclosed subject matter
- FIG. 1 b is a sectional side view of a portion of a handle of the variable speed control system shown in FIG. 1 a;
- FIG. 2 a is a perspective view of a variable speed control system in a second operating position according to an embodiment of the presently disclosed subject matter
- FIG. 2 b is a sectional side view of a portion of a handle of the variable speed control system shown in FIG. 2 a;
- FIG. 3 a is a perspective view of a variable speed control system in a third operating position according to an embodiment of the presently disclosed subject matter
- FIG. 3 b is a sectional side view of a portion of a handle of the variable speed control system shown in FIG. 3 a ;
- FIG. 4 is a front view of a variable speed control system according to an embodiment of the presently disclosed subject matter.
- the present subject matter provides variable speed control systems and methods for walk-behind working machines, such as lawnmowers and similar powered machines.
- the present subject matter provides variable speed control systems and methods that can vary speed, comfortably hold a fixed speed, and maintain speed through changing torque requirements.
- a variable speed control system generally designated 100 can comprise a handle 110 configured to be gripped by an operator to control the operation of a working machine, such as a lawnmower or other small powered machine, to which handle 110 is connected.
- a control system base 120 can be attached to or otherwise positioned near handle 110 , and a control lever 130 can be movably attached to control system base 120 .
- control lever generally designated 130 can be moved to control operation of a machine component, such as for example a variable transmission for a self-propel system of the working machine.
- control lever 130 can comprise a lever arm 132 having a first end that is pivotably attached to control system base 120 (e.g., about a pivot axis 133 ) and a second end substantially opposing the first end that comprises a grip portion 134 .
- control lever 130 can have a substantially L-shaped profile, with grip portion 134 extending at a non-zero angle (e.g., between about 50 and 90 degrees) away from lever arm 132 . This angular arrangement allows the operator to grab grip portion 134 in a comfortable hand position and pivot control lever 130 with respect to control system base 120 .
- control lever 130 can be selectively pivoted with respect to control system base 120 between a first angular position (See, e.g., FIGS. 1 a and 1 b ) at which grip portion 134 of control lever 130 is spaced apart from handle 110 and a second angular position (See, e.g., FIGS. 2 a and 2 b ) at which at least a portion of grip portion 134 is positioned within a recess 112 that is formed in an edge of handle 110 .
- first angular position See, e.g., FIGS. 1 a and 1 b
- FIGS. 2 a and 2 b a second angular position
- this movement of control lever 130 between the first and second angular position can involve pivoting the control lever through a limited angular range (e.g., about 35 degrees) such that the movement of control lever 130 can be comfortably performed by the operator without letting go of handle 110 .
- a limited angular range e.g., about 35 degrees
- the operator can extend his/her thumbs backwards a short distance (e.g., about 71 mm) to grab grip section 134 while keeping his/her other fingers on handle 110 .
- variable speed control system 100 can be easily manipulated while the operator maintains overall control of the working machine.
- recess 112 can be designed to be large enough such that grip portion 134 can be nested substantially entirely within recess 112 .
- pivoting control lever 130 to the second angular position can involve pivoting control lever 130 into a position in which an outer surface 135 of grip portion 134 of control lever 130 is substantially flush with an outer surface generally designated 115 of handle 110 .
- the combination of handle 110 and grip portion 134 can fit together such that the operator can comfortably hold control lever 130 in a substantially fixed manner at the second angular position by squeezing grip portion 134 into recess 112 .
- control lever 130 can be used to control the operation of the associated machine component by connecting a control connector 122 between control lever 130 and the machine component.
- control connector 122 can be a Bowden-type cable in which an inner wire is movable with respect to a hollow outer cable housing to transmit a force to the machine component.
- control lever 130 can be connected to a pivot shaft 123 (e.g., a central longitudinal axis of which acts as pivot axis 133 ) that is pivotable within control system base 120 .
- Pivot shaft 123 can further be connected to control connector 122 such that pivoting movement of control lever 130 can cause rotation of pivot shaft 123 within control system base 120 , which in turn can cause translation of the inner wire of control connector 122 .
- control connector 122 can be contained within (e.g., routed through) control system base 120 and/or handle 110 to prevent inadvertent actuation of control connector 122 . In this way, the pivoting movement of control lever 130 can be translated into changes in the operating state of the connected machine component.
- control connector 122 can be a wired or wireless electrical signal transmitter that enables communication between control lever 130 and the machine component.
- control connector 122 can be configured to control the machine component to be in a first operating state when control lever 130 is in the first angular position.
- the first operating state can be a disengaged state (i.e., no torque applied).
- control connector 122 can be configured to control the machine component to be in a second operating state.
- the second operating state can be a fully engaged or high speed state (i.e., torque applied to the drive system such that the working machine is moved at a predetermined cruising speed).
- the combination of handle 110 and grip portion 134 can fit together such that the operator can comfortably hold control lever 130 in a substantially fixed manner at the second angular position.
- this ability to comfortably maintain control lever 130 in the second angular position means that the operator can maintain the working machine at a cruising speed by simply gripping around the nested combination of handle 110 and grip portion 134 .
- control lever 130 can be further selectively pivotable to a third angular position at which outer surface 135 of grip portion 134 of control lever 130 is depressed into recess 112 of handle 110 .
- control connector 122 can be configured to control the machine component to be in a third operating state.
- the third operating state can comprise an over-stroke state of the machine component that provides additional torque to the self-propel system to account for changing ground conditions (e.g., inclines, uneven ground surfaces).
- grip portion 134 can be depressed into recess 112 (e.g., by using his/her thumbs to press grip portion 134 further into handle 110 ) to the third angular position.
- this additional over-stroke travel from the second angular position to the third angular position can be small compared to the angle of travel between the first angular position and the second angular position.
- handle 110 can be configured to define or include a stop 116 at the back of recess 112 such that once a leading edge 136 of grip portion 134 encounters stop 116 , control lever 130 is prevented from pivoting any farther.
- control lever 130 can additionally be pivoted to any of a variety of intermediate angular positions to correspondingly operate the machine component in one or more partial engagement states (e.g., low- to medium-speed operating states of the self-propel system). In this way, the operator can selectively operate the machine component at states between the first and second operating states.
- partial engagement states e.g., low- to medium-speed operating states of the self-propel system.
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Abstract
Description
- The subject matter disclosed herein relates generally to variable control systems for powered equipment. More particularly, the subject matter disclosed herein relates to variable speed controls and methods for walk-behind working machines, such as lawnmowers.
- Many walk behind working machines, such as lawnmowers and other similar small powered equipment, have a self-propel system that propels or drives the working machine at a selected ground speed. In such systems, a control system is typically carried on the handle to allow the operator to engage and disengage the self-propel system and to select a desired ground speed. For example, many such control systems use a pivotable ground speed control bail on the handle of the working machine. In such systems, the bail can be pivoted to engage the self-propel system, with the degree of movement of the ground speed control bail dictating the ground speed of the working machine.
- In these conventional self-propel systems, however, it can be difficult to maintain the control system in a fixed position corresponding to a desired cruising speed. For example, many control systems lack a fixed position in which the operator can comfortably hold the control bail while operating the working machine at a self-propelled “cruising” speed. In addition, with slipping belt or variable speed type transmissions that are commonly used in many lawnmowers, for example, the driving torque can change depending on the ground conditions such as the slope or ground surface. In such changing conditions, the speed of the transmission may require varying the control in a substantially continual manner to achieve a consistent desired speed.
- In view of these issues, it would be desirable for a ground speed control system to allow for comfortable operation of the working machine at a cruising speed while still enabling changes in the driving torque to account for changing ground conditions.
- In accordance with this disclosure, variable speed control systems and methods for walk-behind working machines, such as lawnmowers and similar powered machines, are provided. In one aspect, a variable speed control system for a walk-behind working machine is provided. The system can comprise a control system base, a handle having a recess being formed in an edge of the handle, a control lever comprising a lever arm having a first end that is pivotably attached to the control system base and a second end substantially opposing the first end that comprises a grip portion, and a control connector connected between the control lever and a machine component. The control lever can be selectively pivotable with respect to the control system base between a first angular position at which the grip portion of the control lever is spaced apart from the handle and a second angular position at which at least a portion of the grip portion is positioned within the recess of the handle. In this arrangement, the control connector can be configured to control the machine component to be in a first operating state when the control lever is in the first angular position and to be in a second operating state when the control lever is in the second angular position.
- In another aspect, a variable speed control system for a walk-behind working machine can comprise a control system base, a handle having a recess disposed or formed in an edge of the handle, a control lever comprising a lever arm having a first end that is pivotably attached to the control system base and a second end substantially opposing the first end that comprises a grip portion, and a control connector connected between the control lever and a machine component. The control lever can be selectively pivotable with respect to the control system base among a first angular position at which the grip portion of the control lever is spaced apart from the handle and a second angular position at which an outer surface of the grip portion of the control lever is substantially flush with an outer surface of the handle, and the control connector can be configured to control the machine component to be in a relatively low-speed operating state when the control lever is in the first angular position and to be in a relatively high-speed operating state when the control lever is in the second angular position.
- In yet another aspect, a method for varying a speed of a walk-behind working machine is provided. The method can comprise pivoting a control lever with respect to a control system base between a first angular position at which a grip portion of the control lever is spaced apart from a handle and a second angular position at which at least a portion of the grip portion is positioned within a recess formed in an edge of the handle. In this way, pivoting the control lever to the first angular position controls a machine component to be in a first operating state, whereas pivoting the control lever to the second angular position controls a machine component to be in a second operating state.
- Although some of the aspects of the subject matter disclosed herein have been stated hereinabove, and which are achieved in whole or in part by the presently disclosed subject matter, other aspects will become evident as the description proceeds when taken in connection with the accompanying drawings as described hereinbelow.
- The features and advantages of the present subject matter will be more readily understood from the following detailed description which should be read in conjunction with the accompanying drawings that are given merely by way of explanatory and non-limiting example, and in which:
-
FIG. 1 a is a perspective view of a variable speed control system in a first operating position according to an embodiment of the presently disclosed subject matter; -
FIG. 1 b is a sectional side view of a portion of a handle of the variable speed control system shown inFIG. 1 a; -
FIG. 2 a is a perspective view of a variable speed control system in a second operating position according to an embodiment of the presently disclosed subject matter; -
FIG. 2 b is a sectional side view of a portion of a handle of the variable speed control system shown inFIG. 2 a; -
FIG. 3 a is a perspective view of a variable speed control system in a third operating position according to an embodiment of the presently disclosed subject matter; -
FIG. 3 b is a sectional side view of a portion of a handle of the variable speed control system shown inFIG. 3 a; and -
FIG. 4 is a front view of a variable speed control system according to an embodiment of the presently disclosed subject matter. - The present subject matter provides variable speed control systems and methods for walk-behind working machines, such as lawnmowers and similar powered machines. In one aspect, the present subject matter provides variable speed control systems and methods that can vary speed, comfortably hold a fixed speed, and maintain speed through changing torque requirements.
- Specifically, for instance, as shown in
FIGS. 1 a through 4, a variable speed control system, generally designated 100 can comprise ahandle 110 configured to be gripped by an operator to control the operation of a working machine, such as a lawnmower or other small powered machine, to whichhandle 110 is connected. Acontrol system base 120 can be attached to or otherwise positioned nearhandle 110, and acontrol lever 130 can be movably attached tocontrol system base 120. With this general configuration, control lever generally designated 130 can be moved to control operation of a machine component, such as for example a variable transmission for a self-propel system of the working machine. - In particular,
control lever 130 can comprise alever arm 132 having a first end that is pivotably attached to control system base 120 (e.g., about a pivot axis 133) and a second end substantially opposing the first end that comprises agrip portion 134. Specifically, for example, as shown inFIGS. 1 a, 2 a, 3 a, and 4,control lever 130 can have a substantially L-shaped profile, withgrip portion 134 extending at a non-zero angle (e.g., between about 50 and 90 degrees) away fromlever arm 132. This angular arrangement allows the operator to grabgrip portion 134 in a comfortable hand position andpivot control lever 130 with respect tocontrol system base 120. - In this regard, to control the operation of the associated machine component (e.g., a self-propel system),
control lever 130 can be selectively pivoted with respect tocontrol system base 120 between a first angular position (See, e.g.,FIGS. 1 a and 1 b) at whichgrip portion 134 ofcontrol lever 130 is spaced apart fromhandle 110 and a second angular position (See, e.g.,FIGS. 2 a and 2 b) at which at least a portion ofgrip portion 134 is positioned within arecess 112 that is formed in an edge ofhandle 110. For example, this movement of control lever 130 between the first and second angular position can involve pivoting the control lever through a limited angular range (e.g., about 35 degrees) such that the movement ofcontrol lever 130 can be comfortably performed by the operator without letting go ofhandle 110. In other words, while the operator is holdinghandle 110 to steer or otherwise control the working machine, the operator can extend his/her thumbs backwards a short distance (e.g., about 71 mm) to grabgrip section 134 while keeping his/her other fingers onhandle 110. As a result, variablespeed control system 100 can be easily manipulated while the operator maintains overall control of the working machine. - With respect to the particular positioning of
control lever 130 during operation of variablespeed control system 100,recess 112 can be designed to be large enough such thatgrip portion 134 can be nested substantially entirely withinrecess 112. In this way, pivoting control lever 130 to the second angular position can involvepivoting control lever 130 into a position in which anouter surface 135 ofgrip portion 134 ofcontrol lever 130 is substantially flush with an outer surface generally designated 115 ofhandle 110. In this way, the combination ofhandle 110 andgrip portion 134 can fit together such that the operator can comfortably holdcontrol lever 130 in a substantially fixed manner at the second angular position by squeezinggrip portion 134 intorecess 112. - This movement of
control lever 130 among the various angular positions discussed above can be used to control the operation of the associated machine component by connecting acontrol connector 122 betweencontrol lever 130 and the machine component. Specifically, for example,control connector 122 can be a Bowden-type cable in which an inner wire is movable with respect to a hollow outer cable housing to transmit a force to the machine component. In one particular arrangement shown inFIG. 4 , for example,control lever 130 can be connected to a pivot shaft 123 (e.g., a central longitudinal axis of which acts as pivot axis 133) that is pivotable withincontrol system base 120.Pivot shaft 123 can further be connected tocontrol connector 122 such that pivoting movement ofcontrol lever 130 can cause rotation ofpivot shaft 123 withincontrol system base 120, which in turn can cause translation of the inner wire ofcontrol connector 122. In addition, at least a portion ofcontrol connector 122 can be contained within (e.g., routed through)control system base 120 and/or handle 110 to prevent inadvertent actuation ofcontrol connector 122. In this way, the pivoting movement ofcontrol lever 130 can be translated into changes in the operating state of the connected machine component. Those having skill in the art will recognize that any of a variety of other configurations forcontrol connector 122 can be used to translate movement ofcontrol lever 130 into changes in the operation of the connected machine component. For example,control connector 122 can be a wired or wireless electrical signal transmitter that enables communication betweencontrol lever 130 and the machine component. - Regardless of its particular arrangement,
control connector 122 can be configured to control the machine component to be in a first operating state whencontrol lever 130 is in the first angular position. For instance, where the machine component is a self-propel system for a working machine, the first operating state can be a disengaged state (i.e., no torque applied). Upon movement ofcontrol lever 130 to the second angular position, however,control connector 122 can be configured to control the machine component to be in a second operating state. Again, for instance, where the machine component is a self-propel system for a working machine, the second operating state can be a fully engaged or high speed state (i.e., torque applied to the drive system such that the working machine is moved at a predetermined cruising speed). - As discussed above, the combination of
handle 110 andgrip portion 134 can fit together such that the operator can comfortably holdcontrol lever 130 in a substantially fixed manner at the second angular position. With respect to the operation of a self-propel system, this ability to comfortably maintaincontrol lever 130 in the second angular position means that the operator can maintain the working machine at a cruising speed by simply gripping around the nested combination ofhandle 110 andgrip portion 134. - In addition,
recess 112 can be configured such that it is large enough thatgrip portion 134 can be depressed beyond the point at whichouter surface 135 ofgrip portion 134 is aligned substantially flush withouter surface 115 ofhandle 110. In this regard,control lever 130 can be further selectively pivotable to a third angular position at whichouter surface 135 ofgrip portion 134 ofcontrol lever 130 is depressed intorecess 112 ofhandle 110. Withcontrol lever 130 in this third angular position,control connector 122 can be configured to control the machine component to be in a third operating state. For instance, the third operating state can comprise an over-stroke state of the machine component that provides additional torque to the self-propel system to account for changing ground conditions (e.g., inclines, uneven ground surfaces). In this way, from the second angular position, if the operator desires to apply additional driving torque (e.g., to travel up a hill),grip portion 134 can be depressed into recess 112 (e.g., by using his/her thumbs to pressgrip portion 134 further into handle 110) to the third angular position. Depending on the configuration ofrecess 112, this additional over-stroke travel from the second angular position to the third angular position can be small compared to the angle of travel between the first angular position and the second angular position. To limit the extent of this over stroke, handle 110 can be configured to define or include astop 116 at the back ofrecess 112 such that once aleading edge 136 ofgrip portion 134 encounters stop 116,control lever 130 is prevented from pivoting any farther. - Furthermore, those having skill in the art will recognize that
control lever 130 can additionally be pivoted to any of a variety of intermediate angular positions to correspondingly operate the machine component in one or more partial engagement states (e.g., low- to medium-speed operating states of the self-propel system). In this way, the operator can selectively operate the machine component at states between the first and second operating states. - The present subject matter can be embodied in other forms without departure from the spirit and essential characteristics thereof. The embodiments described therefore are to be considered in all respects as illustrative and not restrictive. Although the present subject matter has been described in terms of certain preferred embodiments, other embodiments that are apparent to those of ordinary skill in the art are also within the scope of the present subject matter.
Claims (20)
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US14/081,875 US9185843B2 (en) | 2013-11-15 | 2013-11-15 | Variable speed control systems and methods for walk behind working machine |
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US14/081,875 US9185843B2 (en) | 2013-11-15 | 2013-11-15 | Variable speed control systems and methods for walk behind working machine |
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US9470305B2 (en) | 2014-01-24 | 2016-10-18 | Honda Motor Co., Ltd. | Variable speed control systems and methods for walk-behind working machines |
WO2016207833A1 (en) * | 2015-06-26 | 2016-12-29 | Husqvarna Ab | Drive control, walk behind outdoor powertool |
WO2018201525A1 (en) * | 2017-05-02 | 2018-11-08 | 南京德朔实业有限公司 | Walk-behind self-propelled machine |
CN108790946A (en) * | 2017-05-02 | 2018-11-13 | 南京德朔实业有限公司 | Walk-behind self-propelled machine |
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US9403435B2 (en) * | 2014-10-14 | 2016-08-02 | Honda Motor Co., Ltd. | Adjustable ground speed control devices, systems, and methods for walk-behind equipment |
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US9538699B1 (en) * | 2015-07-06 | 2017-01-10 | Honda Motor Co., Ltd. | Adjustable ground speed and acceleration control devices, systems, and methods for walk-behind equipment |
US10214869B1 (en) | 2016-04-28 | 2019-02-26 | Briggs & Stratton Corporation | Outdoor power equipment including electric wheel motors and controls |
CN109392466B (en) | 2018-12-20 | 2023-08-22 | 格力博(江苏)股份有限公司 | Control box and garden tool with same |
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